CN101888695B - Time service method, system and device of base station - Google Patents
Time service method, system and device of base station Download PDFInfo
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- CN101888695B CN101888695B CN 200910084014 CN200910084014A CN101888695B CN 101888695 B CN101888695 B CN 101888695B CN 200910084014 CN200910084014 CN 200910084014 CN 200910084014 A CN200910084014 A CN 200910084014A CN 101888695 B CN101888695 B CN 101888695B
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Abstract
The invention provides a time service method of a base station. In the method, an OCU (Outdoor Clock Unit) receives satellite signals, obtains time information and sends a clock synchronization message to an ICU (Indoor Clock Unit); and the ICU recovers local clock synchronization signals according to the clock synchronization message and the line delay between the OCU and the ICU. A satellite receiver can be arranged in a far place by the method, the OCU and the ICU can be connected through a common optical fiber by line coding. The method not only can greatly reduce the cost, but also can enable the receiver to have flexible site selection and reduce construction difficulty. Moreover, the base station does not need considering the lighting stroke problem caused by the receiver.
Description
Technical field
The present invention relates to communication technical field, particularly a kind of time service method of base station, system and device.
Background technology
At present, the time synchronized of NB (base station) mainly is to realize by the satellite system time service in the mobile communications network.As shown in Figure 1, schematic diagram for NB Time Synchronizing in the prior art, antenna reception satellite-signal (the Big Dipper for example, the satellite-signals such as GPS), by radio frequency line with the satellite signal receiver (such as Beidou receiver) of radio signal transmission in the NB, the satellite signal receiver recovered clock, output clock synchronizing signal (PPS for example, Plus Per Second, pulse per second (PPS)) and temporal information (TOD for example, Time of Date, zero-time) to the interior phase-locked loop of NB, phase-locked loop is issued to the time signal that locks needs each of time synchronized integrated circuit board in the NB.
The shortcoming of existing NB Time Synchronizing is: because antenna is connected by radio frequency line with satellite signal receiver, and radio frequency line not only cost is high, and the distance that radio frequency line zooms out is limited, if surpass preset distance, just need to increase line and put device, so not only for construction makes troubles, also further increased cost.In addition, radio frequency line is also introduced NB with thunder and lightning easily, causes the damage of NB.
Summary of the invention
Purpose of the present invention is intended to solve at least one of above-mentioned technological deficiency, particularly solves in the prior art because radio frequency line causes cost to increase and cause the problem of thunderbolt.
For achieving the above object, one aspect of the present invention proposes a kind of time service method of base station, may further comprise the steps: outdoor clock unit OCU receiving satellite signal also obtains temporal information, and described OCU is to indoor clock unit ICU tranmitting data register synchronization message; Described ICU recovers the local clock synchronizing signal according to the line delay between described clock synchronous message and described OCU and the ICU.
The present invention also proposes a kind of time service system of base station on the other hand, comprise antenna, the OCU that links to each other with described antenna, with the ICU that is positioned at described base station and links to each other with described OCU, described OCU, be used for receiving satellite signal, and obtain temporal information according to satellite-signal, and to described ICU tranmitting data register synchronization message; Described ICU is used for recovering the local clock synchronizing signal according to the line delay between described clock synchronous message and described OCU and the ICU.
Further aspect of the present invention also proposes a kind of OCU, comprises satellite receiver module, sending module, control and management module and interface module, and described interface module is used for communicating with ICU; Described satellite receiver module is used for receiving satellite signal, and obtains temporal information according to satellite-signal; Described sending module is used for after obtaining temporal information to described ICU tranmitting data register synchronization message; Described control and management module is used for controlling the communication between described OCU and the described ICU.
The present invention also proposes a kind of ICU, comprises that interface module, receiver module, clock sync signal recover module and control and management module, and described interface module is used for communicating with OCU; Described receiver module is used for receiving the clock synchronous message that described OCU sends; Described control and management module is used for controlling the communication between described OCU and the described ICU; Described clock sync signal recovers module, is used for according to described clock synchronous message recovery local clock signal.
Satellite receiver can be zoomed out by the present invention, and by line coding OCU is linked to each other with ICU by ordinary optic fibre, can not only greatly reduce cost, and can make the receiver addressing flexible, reduce difficulty of construction, and BBU need not to consider the problem of lightning that causes because of receiver again.
The aspect that the present invention adds and advantage in the following description part provide, and part will become obviously from the following description, or recognize by practice of the present invention.
Description of drawings
Above-mentioned and/or the additional aspect of the present invention and advantage are from obviously and easily understanding becoming the description of embodiment below in conjunction with accompanying drawing, wherein:
Fig. 1 is the schematic diagram of NB Time Synchronizing in the prior art;
Fig. 2 is the time service method flow chart of embodiment of the invention base station;
Fig. 3 is the line delay instrumentation plan of the embodiment of the invention;
Fig. 4 is the schematic diagram that the embodiment of the invention sends the PPS synchronization message;
Fig. 5 is the time service system schematic of base station of the present invention;
Fig. 6 is the structure chart of embodiment of the invention OCU;
Fig. 7 is the structure chart of embodiment of the invention ICU.
Embodiment
The below describes embodiments of the invention in detail, and the example of described embodiment is shown in the drawings, and wherein identical or similar label represents identical or similar element or the element with identical or similar functions from start to finish.Be exemplary below by the embodiment that is described with reference to the drawings, only be used for explaining the present invention, and can not be interpreted as limitation of the present invention.
As shown in Figure 2, the time service method flow chart for embodiment of the invention base station may further comprise the steps:
Step S201, ICU send the information of seeking to OCU after powering on, wait for after OCU powers on that equally ICU sends the information of seeking.
Step S202, OCU receive after the information of seeking that the essential information with OCU sends to ICU.
Step S203, ICU judges according to the essential information of OCU whether OCU is normal, if ICU judges OCU normally then configuration information is sent to OCU.
Step S204, OCU is configured according to configuration information.
Step S205, measure the line delay (delay) between OCU and the ICU, line delay is fixed value in the present invention, after ICU and OCU configure, this line delay just can not change, therefore can when the base station is set, measurement circuitry postpone in the present invention, and line delay is arranged in the base station once.In other embodiments, also can measure at any time this line delay by the delay measurements message that mutually sends between OCU and the ICU.Can adopt various ways to measure this line delay, for example, available following mode is calculated this line delay, particularly, as shown in Figure 3, is the line delay instrumentation plan of the embodiment of the invention.In this embodiment, mainly measuring message (CD_SYNC message) by forward delay interval realizes, this CD_SYNC message adopts redundancy encoding or the scrambler with equilibrium characteristic, such as 4B/5B or 8B/10B coding etc. as more specifically embodiment of the present invention, is encoded to example with 8B/10B, the structure of this CD_SYNC message is as follows, this CD_SYNC message is made of ST, SI, DI and four fields of SEQ, and wherein ST can be the K28.2 in the 8B/10B coding for beating the stamp mark; SI is the device id of CD_SYNC originating end; DI is the device id of CD_SYNC destination; SEQ is serial ID.But need to prove; above-mentioned only is comparatively preferred embodiment of the present invention as an example of redundancy encoding with equilibrium characteristic or scrambler example; be not that the present invention only can realize by these two kinds codings; those skilled in the art can know also can realize purpose of the present invention by other coded systems, so other coded systems also should be included within protection scope of the present invention.
The idiographic flow of measuring is:
First-selection, ICU sends the first Time delay measurement message (CD_SYNC 1) to OCU, and the time T 1 of record transmission, and then OCU receives the first Time delay measurement message, and the time T 2 of record reception.
Afterwards, OCU sends the second Time delay measurement message (CD_SYNC 2) to ICU, and the time T 3 of record transmission; Then ICU receives the second Time delay measurement message, and the time T 4 of record reception;
At last, OCU sends to ICU with time T 2 and the T3 of record, and ICU postpones according to time T 1, T2, T3 and T4 computational scheme, for example line delay can be=(T2-T1+T4-T3)/2.
In another embodiment of the present invention, OCU sends to ICU with the difference of T2 and T3, and ICU postpones according to the poor computational scheme of T1, T4 and T2 and T3.In other embodiments, also can adopt loopback to measure message and measure, OCU sends the second Time delay measurement message, like this T2=T3 when receiving the first Time delay measurement message, ICU can postpone by computational scheme according to T4 and T1, i.e. line delay=(T4-T1)/2.
From foregoing description, can find out; can calculate in several ways the line delay between OCU and the ICU; above embodiment is the comparatively preferred mode of the present invention; but be not only can postpone by above-described embodiment measurement circuitry, the method that other measurement circuitry postpone also all should be included within protection scope of the present invention.
Step S206, the OCU receiving satellite signal also obtains temporal information according to satellite-signal, and carries out interacting message with ICU and be adjusted into satellite-signal consistent with the clock with ICU.The present invention mainly is to reach purpose to the base station time service by the interacting message between ICU and the OCU, thereby can avoid adopting radio frequency line of the prior art.
As embodiments of the invention, OCU can be after obtaining satellite-signal in the present invention, ICU at once satellite-signal is converted into clock synchronous message (such as PPS message) and sends to ICU, so that can adjust according to this clock synchronous message (such as PPS message) clock of self.Perhaps, OCU is after obtaining satellite-signal, adjust first the clock of OCU self according to satellite-signal, the clock of OCU is alignd with the time signal that satellite receiver is recovered, this moment, the resolution of OCU clock can reach the ns magnitude, OCU just need not to send at once after obtaining satellite-signal like this, can send during the free time in system.The present invention has all proposed specific embodiment for above-mentioned dual mode, specifically referring to following description:
In one embodiment of the invention, OCU can send PPS synchronization message (clock synchronous message) and TOD to ICU at once after obtaining satellite-signal.Particularly, OCU sends PPS synchronization message (PPS_SYNC message) at the rising edge of satellite PPS signal to ICU, as shown in Figure 4, sends the schematic diagram of PPS synchronization message for the embodiment of the invention.In an embodiment of the present invention, PPS_SYNC message also can adopt redundancy encoding or the scrambler with equilibrium characteristic, for example 4B/5B or 8B/10B encode, but the priority of PPS_SYNC message will be higher than the priority of CD_SYNC message, the priority of CD_SYNC message will be higher than the priority of common message, that is to say that if OCU has PPS_SYNC message to send then OCU preferentially sends PPS_SYNC message with regard to suspending transmission CD_SYNC message and common message.
In specific embodiments of the invention, PPS_SYNC message is used for mark PPS signal, only has the K28.5 in the 8B/10B coding to consist of.In another embodiment of the present invention, common message is used for sending general data, is made of SPD, SI, DI, TYPE, DATA, CRC and EPD field.Wherein, SPD is the frame head mark, can be the K 27.7 in the 8B/10B coding; SI is the device id of originating end; DI is the device id of destination; TYPE is the type of service of carrying data; CRC is CRC check; EPD is for being the postamble mark
In another embodiment of the present invention, OCU is after obtaining satellite-signal, adjust first the clock of OCU self according to satellite-signal, the time signal that OCU clock and satellite receiver are recovered aligns, and processing OCU clock resolution this moment of process OCU can reach the ns magnitude.OCU is to ICU tranmitting data register synchronization message, the time T 1 that has comprised OCU when sending in this clock synchronous message, to ICU, ICU makes the clock of ICU and the clock alignment of OCU according to the clock of this clock synchronous message adjustment self to this clock synchronous message through Optical Fiber Transmission.
Step S207, ICU recovers the local clock synchronizing signal according to the line delay between clock synchronous message and OCU and the ICU.For the Different treatments of OCU in above-described embodiment, the corresponding processing of ICU side also is different.
For example, if OCU sends PPS synchronization message (clock synchronous message) and TOD to ICU at once after obtaining satellite-signal, then ICU can recover local PPS signal according to the PPS synchronization message, and local PPS signal, line delay and TOD are offered phase-locked loop.Owing to have line delay between the local PPS signal that recovers and the satellite PPS signal, therefore when processing, tackle this line delay and compensate.
If OCU adjusts first the clock of OCU self according to satellite-signal after obtaining satellite-signal, again according to self clock tranmitting data register synchronization message, then at first to detect the time of clock synchronous message then be T1+Delay to ICU, also safeguarding in ICU has a clock, supposes that the clock time of this ICU was T2 when ICU detected clock synchronous message.At this moment, ICU just can judge whether the clock of the clock of ICU and OCU is synchronous according to T1, T2 and line delay delay, if OCU clock and ICU clock synchronous, then T2=T1+delay; If asynchronous then ICU can adjust according to error T2-(T1+delay) clock of self, make the ICU clock synchronous in the OCU clock.In one embodiment of the invention, the clock of computational scheme delay can adopt OCU clock and ICU clock.In one embodiment of the invention, comprise at least a or multiple satellite receiver among the OCU, be used for receiving the signal of different satellites, for example comprise Beidou receiver and GPS receiver, these two receivers are worked by OCU simultaneously.
In another embodiment of the present invention, because OCU is outdoor, so the poor-performing of its crystal oscillator, in order to remedy this defective, also need in this embodiment to utilize the high characteristics of ICU clock short term stability oppositely to OCU feedback frequency information.Particularly, ICU sends to OCU with the PPS coding of ICU, this PPS coding is to be produced by the PPS information that recovers from the OCXO frequency of NB internal clock plate, OCU is the PPS signal with the PPS code restoration that receives, and itself and the satellite PPS signal that obtains carried out phase demodulation, and identified result returned to ICU, ICU will feed back to through the Offset of feedback compensation the phase-locked loop module of clock board, adjust the final time signal with the satellite receiver recovery of OCXO and align.The high precision clock of OCXO in the NB can be passed to OCU by this embodiment, thereby provide more high-grade clock for satellite receiver.
In another embodiment of the present invention, because OCU is in far-end, be unfavorable for on-site maintenance, be necessary in OCU, to add from Restoration Mechanism that therefore can increase house dog in OCU solves this problem.
As shown in Figure 5, be the time service system schematic of base station of the present invention, this system comprises antenna 100, and the OCU 200 that links to each other with antenna 100 is with the ICU300 that is positioned at the base station and links to each other with OCU 200.OCU 200 is used for receiving satellite signal, and obtains temporal information according to satellite-signal, and to ICU 300 tranmitting data register synchronization messages.ICU 300 is used for recovering the local clock synchronizing signal according to the line delay between clock synchronous message and OCU and the ICU.
As one embodiment of the present of invention, OCU 200 sends PPS synchronization message and zero-time TOD to ICU300 at once when receiving satellite PPS signal, ICU 300 recovers the PPS signal according to the PPS synchronization message, and PPS signal, line delay and TOD are offered phase-locked loop.
In another embodiment of the present invention, OCU 200 receiving satellite signals obtain temporal information, and the time signal that the clock of OCU 200 and satellite receiver are recovered aligns, OCU 200 is to ICU300 tranmitting data register synchronization message, and ICU 300 is according to clock synchronous message and the line delay clock alignment with self clock and OCU 200.
In the above-described embodiments, line delay is measured by mutual forward delay interval measurement message between OCU and the described ICU.Wherein, interaction message all can adopt redundancy encoding or the scrambler with equilibrium characteristic, such as 4B/5B or 8B/10B coding.
In one embodiment of the invention, comprise one or more satellite receiver among the OCU 200.
In one embodiment of the invention, ICU 300 also is used for the clock synchronization information coding of ICU 300 is sent to OCU 200.The clock synchronization information decoding that OCU 200 also is used for receiving reverts to clock sync signal, and itself and satellite clock synchronizing signal are carried out phase demodulation, and identified result is returned to ICU 300.
As shown in Figure 6, be the structure chart of embodiment of the invention OCU, OCU comprises satellite receiver module 610, sending module 620, control and management module 630 and interface module 640.Interface module 640 is used for communicating with ICU, as interface module 640 can finish when sending and go here and there transformation function and string and transformation function when receiving.Satellite receiver module 610 is used for receiving satellite signal, and obtains temporal information according to satellite-signal, can comprise in one embodiment of the invention a plurality of satellite receiver modules.Sending module 620 is used for after obtaining temporal information to ICU tranmitting data register synchronization message.Control and management module 630 is used for the communication between control OCU and the ICU and finishes the functions such as protocol processes, the processing of timestamp, also needs in addition satellite receiver module 610 is managed and safeguards.
In one embodiment of the invention, OCU also comprises receiver module 650 and beats stamp module 660.Receiver module 650 is used for receiving the first Time delay measurement message that ICU sends.Sending module 620 also is used for sending the second Time delay measurement message to ICU.Beat stamp module 660 and be used for the time T 2 that record receives the first Time delay measurement message, and the time T 3 that sends the second Time delay measurement message, and the difference of time T 2 and time T 3 or time T 3 and time T 2 is fed back to control and management module 630.Control and management module 630 sends to ICU for controlling the difference of sending module 620 with time T 2 and time T 3 or time T 3 and time T 2 with common message.
In the above-described embodiments, PPS synchronization message and Time delay measurement message all adopt redundancy encoding or the scrambler with equilibrium characteristic, such as 4B/5B or 8B/10B coding.
In one embodiment of the invention, OCU comprises that also clock synchronous recovers module 670 and phase demodulation module 680.Receiver module 650 also is used for the clock synchronous message coding of the ICU of reception ICU transmission.Clock synchronous recovers module 670 and reverts to clock sync signal for the clock synchronous message coding that will receive.Phase demodulation module 680 is used for that clock synchronous is recovered the clock sync signal of module 670 recoveries and the satellite PPS signal of acquisition carries out phase demodulation, and identified result is returned to control and management module 630.Control and management module 630 also is used for control sending module 620 identified result is sent to ICU with common message.
As shown in Figure 7, be the structure chart of embodiment of the invention ICU, this ICU comprises that interface module 710, receiver module 720, PPS recover module 730 and control and management module 740.Interface module 710 is used for communicating with OCU.Receiver module 720 is used for receiving the clock synchronous message that OCU sends.The communication that control and management module 740 is used between control OCU and the ICU.Clock synchronous recovers module 750 and is used for according to clock synchronous message recovery local clock signal, and it is relevant with the clock sync signal that OCU sends wherein specifically how to recover the local clock signal, specifically can referring to above-described embodiment, not repeat them here.
In one embodiment of the invention, this ICU also comprises sending module 750 and beats stamp module 760.Sending module 750 also is used for sending the first Time delay measurement message to OCU.Receiver module 720 is used for receiving the second Time delay measurement message that OCU sends, and receives time T 2 and the time T 3 that OCU sends, and perhaps time T 3 and time T 2 is poor.Beat stamp module 760 and be used for the time T 1 that record sends the first Time delay measurement message, and the time T 4 that receives the second Time delay measurement message, perhaps time T 4 and time T 1 is poor, and feeds back to control and management module 740.Control and management module 740 is used for according to time T 1, T2, T3 and T4, and perhaps T1, T4 and T3 and T2's is poor, perhaps calculates described line delay according to the difference of T4 and T1 and the difference of T3 and T2.
In one embodiment of the invention, sending module 750 also is used for the clock synchronous message coding of ICU is sent to OCU.Receiver module 720 also is used for receiving the identified result that OCU returns, and identified result is delayed to compensate, and the identified result after the compensation of delaying is fed back to phase-locked loop.
Satellite receiver can be zoomed out by the present invention, and by line coding OCU is linked to each other by ordinary optic fibre with ICU, can not only greatly reduce cost, and can make the receiver addressing flexible, reduce difficulty of construction, no longer be subjected to distance restriction, and BBU need not to consider the problem of lightning that causes because of receiver again.
Although illustrated and described embodiments of the invention, for the ordinary skill in the art, be appreciated that without departing from the principles and spirit of the present invention and can carry out multiple variation, modification, replacement and modification to these embodiment that scope of the present invention is by claims and be equal to and limit.
Claims (17)
1. the time service method of a base station is characterized in that, may further comprise the steps:
Outdoor clock unit OCU receiving satellite signal also obtains temporal information, and described OCU is to indoor clock unit ICU tranmitting data register synchronization message;
Described ICU recovers the local clock synchronizing signal according to the line delay between described clock synchronous message and described OCU and the ICU,
Wherein, described OCU links to each other by optical fiber with described ICU,
Wherein, described OCU receiving satellite signal also obtains temporal information, and comprises to ICU tranmitting data register synchronization message:
Described OCU sends PPS synchronization message and zero-time TOD to described ICU at once when receiving the pulse per second (PPS) PPS signal that satellite receiver is recovered, described ICU recovers the PPS signal according to described PPS synchronization message, and described PPS signal, line delay and TOD are offered the phase-locked loop of inside of base station
And wherein, described time service method also comprises:
After powering on, described ICU seeks message to described OCU transmission;
Described OCU receives the described essential information of seeking after the message described OCU and sends to described ICU;
Described ICU judges according to the essential information of described OCU whether described OCU is normal;
After described ICU judges that described OCU is normal, configuration information is sent to described OCU.
2. the time service method of base station as claimed in claim 1 is characterized in that, described line delay is measured message by mutual forward delay interval between described OCU and the described ICU and measured.
3. the time service method of base station as claimed in claim 1 is characterized in that, the interaction message between described OCU and the ICU all adopts redundancy encoding or the scrambler with equilibrium characteristic.
4. the time service method of base station as claimed in claim 1 is characterized in that, comprises one or more satellite receiver among the described OCU.
5. the time service method of base station as claimed in claim 1 is characterized in that, also comprises:
Described ICU sends to described OCU with the clock synchronization information coding of described ICU;
Described OCU is clock sync signal with the clock synchronization information code restoration that receives, and itself and satellite clock synchronizing signal are carried out phase demodulation, and identified result is returned to described ICU.
6. the time service system of a base station is characterized in that, comprises antenna, the OCU that links to each other with described antenna, and with the ICU that is positioned at described base station and links to each other with described OCU,
Described OCU is used for receiving satellite signal, and obtains temporal information according to satellite-signal, and to described ICU tranmitting data register synchronization message;
Described ICU is used for recovering the local clock synchronizing signal according to the line delay between described clock synchronous message and described OCU and the ICU,
Wherein, described OCU links to each other by optical fiber with described ICU,
Wherein, described OCU sends PPS synchronization message and zero-time TOD to described ICU at once when receiving the pulse per second (PPS) PPS signal that satellite receiver is recovered, described ICU recovers the PPS signal according to described PPS synchronization message, and described PPS signal, line delay and TOD is offered the phase-locked loop of inside of base station.
7. the time service system of base station as claimed in claim 6 is characterized in that, described line delay is measured message by mutual forward delay interval between described OCU and the described ICU and measured.
8. the time service system of base station as claimed in claim 7 is characterized in that, the interaction message between described OCU and the described ICU all adopts redundancy encoding or the scrambler with equilibrium characteristic.
9. the time service system of base station as claimed in claim 6 is characterized in that, comprises one or more satellite receiver among the described OCU.
10. the time service system of base station as claimed in claim 6 is characterized in that,
Described ICU also is used for the clock synchronization information coding of described ICU is sent to described OCU;
Described OCU, the clock synchronization information decoding that also is used for receiving reverts to clock sync signal, and itself and satellite clock synchronizing signal are carried out phase demodulation, and identified result is returned to described ICU.
11. an OCU is characterized in that, comprises satellite receiver module, sending module, control and management module and interface module,
Described interface module is used for communicating with ICU;
Described satellite receiver module is used for receiving satellite signal, and obtains temporal information according to satellite-signal; Described sending module is used for after obtaining temporal information to described ICU tranmitting data register synchronization message;
Described control and management module is used for controlling the communication between described OCU and the described ICU,
Wherein, described OCU links to each other by optical fiber with described ICU,
Wherein, described OCU sends PPS synchronization message and zero-time TOD to described ICU at once when receiving the pulse per second (PPS) PPS signal that satellite receiver is recovered, described ICU recovers the PPS signal according to described PPS synchronization message, and described PPS signal, line delay and TOD is offered the phase-locked loop of inside of base station.
12. OCU as claimed in claim 11 is characterized in that, also comprises receiver module and beats the stamp module,
Described receiver module is used for receiving the first Time delay measurement message that described ICU sends;
Described sending module also is used for sending the second Time delay measurement message to described ICU;
The described stamp module of beating is used for the time T 2 that record receives described the first Time delay measurement message, and the time T 3 that sends described the second Time delay measurement message, and the difference of time T 2 and time T 3 or time T 3 and time T 2 is fed back to the control and management module;
Described control and management module is used for controlling described sending module with time T 2 and time T 3, and perhaps the difference of time T 3 and time T 2 sends to described ICU with common message.
13. OCU as claimed in claim 11 is characterized in that, described clock synchronous message and Time delay measurement message all adopt redundancy encoding or the scrambler with equilibrium characteristic.
14. OCU as claimed in claim 12 is characterized in that, comprises that also clock synchronous recovers module and phase demodulation module;
Described receiver module also is used for receiving the clock synchronous message coding of the described ICU that described ICU sends;
Described clock synchronous recovers module, and the described clock synchronous message coding that is used for receiving reverts to clock sync signal;
Described phase demodulation module is used for clock sync signal and the satellite clock synchronizing signal of described clock synchronous recovery module recovery are carried out phase demodulation, and identified result is returned to described control and management module;
Described control and management module also is used for controlling described sending module identified result is sent to described ICU with common message.
15. an ICU is characterized in that, comprises that interface module, receiver module, clock synchronous recover module and control and management module,
Described interface module is used for communicating with OCU;
Described receiver module is used for receiving the clock synchronous message that described OCU sends;
Described control and management module is used for controlling the communication between described OCU and the described ICU;
Described clock synchronous recovers module, is used for recovering the local clock signal according to the line delay between described clock synchronous message and OCU and the ICU,
Wherein, described OCU links to each other by optical fiber with described ICU,
Wherein, described OCU sends PPS synchronization message and zero-time TOD to described ICU at once when receiving the pulse per second (PPS) PPS signal that satellite receiver is recovered, described ICU recovers the PPS signal according to described PPS synchronization message, and described PPS signal, line delay and TOD is offered the phase-locked loop of inside of base station.
16. ICU as claimed in claim 15 is characterized in that, described clock synchronous message and Time delay measurement message all adopt redundancy encoding or the scrambler with equilibrium characteristic.
17. ICU as claimed in claim 15 is characterized in that,
Described sending module also is used for the clock synchronous message coding of described ICU is sent to described OCU;
Described receiver module also is used for receiving the identified result that described OCU returns, and described identified result is delayed to compensate, and the identified result after the compensation of delaying is fed back to phase-locked loop.
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| CN101888695A (en) | 2010-11-17 |
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